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INSTRUCTION AND OPERATING MANUAL

FOR

MODEL 500A

ELECTRONICFREQUENCY METER

Serial 2315 and Above

APLIED PHYSICS STAF,

'lUDN"'\TIO AND CERTIFICATIO GROUP

COpy · DO NOT REMOVE FROMORV

HEWLETT-PACKARD COMPANY

395 PAGE MILL ROAD. PALO ALTO. CALIFORNIA. UoS. A.

General Description

The Model 500A Frequency Meter directly measures the frequency of analternating current voltage from 5 to 50, 000 cycles/sec. It will operate withthe input voltage as low as .5 volts. Variation of the input voltage from. 5 to200 volts or variation of line voltage from 105 to 125 volts has very little effecton the accuracy of the instrument.

This instrument is useful for measuring the beat frequency between tworadio frequency signals, crystal frequency deviation, audio frequencies, andfor measuring the speed of rotating machinery when used in conjunction with aphoto tube and a light source.

CAUTION

THE MAXIMUM VOLTAGE APPLIED TO THE INPUT TERMINALS OF THIS

INSTRUMENT MUST NOT EXCEED 600 VOLTS, THE SUM OF THE DC VOLTAGE

AND THE AC PEAK VOLT AGE. HIGHER VOLT AGES WILL BREAK DOWN THE

CAPACITOR IN THE INPUT CIRCUIT OF THIS INSTRUMENT.

Parts Substitutions

Difficulties in procuring some of the parts used in this instrument maycause the electrical or physical values to deviate from those shown in this in­struction manual. These substitutions have been made so as not to impair theperformance of this instrument. Whenever replacement of any of these partsis necessary, either the substitute value or the original value may be used.

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INSTRUCTIONS

MODEL 500A

ELECTRONIC FREQUENCY METER

Specifications

Frequency Rating --

Range- 10 to 50,000 cycles/sec o in ten ranges.

Full Scale Indication - 50, 100, 200, and 500 cycles/sec.1, 2, 5, 10, 20, and 50 KC/sec.

Input Voltage --

Minimum Input Voltage- 05 volts Variation of the input voltage from05 to 200 volts will affect the meter indication not more than ±1 %.

Input Impedance --

Approximately 300, 000 ohms shunted by 37 1J.1J.f.

Accuracy --

±2% of full scale.

Voltage Stability --

Power line voltage variations from 105 to 125 volts will affect themeter indication less than ±1% .

Recorder Output Characteristics

Current - 1 mao

Resistance - 1400 ohms ±100 ohms

Power Supply Rating --

Voltage - 105 to 125 volts/210 to 250 voltsFrequency - 50/60 cycles/sec.Wattage - 65 watts

Overall Dimensions --

Cabinet Model - 19" wide x 8-1/2" high x 11 -1/2" deep

Rack Model - 19" wide x 8-3/4 11 high X 11-1/2" deepPanel Size - 19 11 x 8-3/4"Depth Behind Panel - 10-1/2 1

'

-1-

Weight --

Cabinet Model - 20 lbs.Rack Model - 20 lbs.

Operating Instructions

Inspection --

This instrument has been thoroughly tes ted and inspected before beingshipped and is ready for us e when received.

After the instrument is unpacked, the instrument should be carefully in­spected for damage received in transit. If any shipping damage is found, followthe procedure outlined in the "Claim for Damage in Shipment" page at the backof this ins truction book.

Controls and Terminals

INPUT - These binding posts are connected to the input circuit of thefrequency meter. The binding post marked G is connected to the chassis.

CAUTION

THE MAXIMUM VOLTAGE APPLIED TO THE INPUT TERMINALS OF THIS

INSTRUMENT MUST NOT EXCEED 600 VOLTS, THE SUM OF THE DC VOLT AGE

AND THE AC PEAK VOLT AGE. HIGHER VOLT AGES WILL BREAK DOWN THE

CAPACITOR IN THE INPUT CIRCUIT OF THIS INSTRUMENT.

TEST - This switch is provided for testing the input voltage level todetermine if it is adequate to operate the instrument.

PHOTOTUBE - This jack is provided for connecting a phototube to theinstrument to' convert the instrument to an electronic tachometer. When theplug is inserted in this jack, the input circuit is changed to match the character­istics of a type lP4l phototube.

USE-LINE FREQ - CALIBRATE - This switch is used to connect theindicating meter and input ClTcuit to perform several functions. The switchposi tion and corresponding functions are listed below.

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Switch Position

USE

LINE FREQ.

-2-

Function

The meter is connected toindicate frequency and theINPUT terminals are connectedto the input of the amplifier.

The meter is connected toindicate frequency. The 6.3 V.

CALIBRATE

secondary of the power

transformer is connected

acros s the input of the

amplifier in order to measure

the power line frequency as a

check on the instrumentcalibration.

The meter is connected as a

DC milliameter to measure the

current drawn by the switching

tubes (V4,. V5). The current

is adjusted so that the meter

pointer coincides with the

calibration mark on the meter

scale. The amplifier input

is short circuited when the

switch is in this position.

RANGE _ This switch is used to insert the correct coupling capacitors and

meter shunt resistors in the circuit for any desired range of frequency measure­

ment.

CALIBRATE - This control is used to adjust the current drawn by the

switching tubes.

RECORDER - The RECORDER jack is provi ded for connecting a recorder

to the instrument. This instrument is designed to drive an Easterline - Angus

Automatic Recorder. However, other recorders may be substituted if their

resistance is 1400 ohms ±100 ohms and a full scale indication can be obtained

with a current of one milliampere.

ON - OFF - This toggle switch controls all the power supplied to the

instrument from the power line.

FUSE - The fuseholder, located on the back of the instrument, contains

a 1 ampere cartridge fuse. To replace the fuse, unscrew the fuseholder cap and

remove the blown fuse, insert a new fuse of the same type and replace the fuse­

holder cap. For 230 volt operation this fuse should have a 1/2 ampere rating.

Replacement fuses must be of the "Slo-Blo" type as specified in the Table of

Replaceable Parts in this instruction manual.

Power Cable - This is a special three conductor power cable with a

standard two prong male plug molded on one end. The third conductor (green)

protrudes from the power cable near the plug and may be used to connect the

instrument chassis to an external ground.

-3-

Operation --

The procedure for me asuring frequency is as follows:

1. Turn the power switch to ON and allow the instrume nt to warm up fortwo or three minutes. If maximum accuracy is desired, me asurements shouldnot be made until the instrument is completely warmed up.

2. Set the USE-LINE FREQ. -CALIBRATE switch to the CALIBRATEposi tion. Adjust he CALIBRATE control so that the me ter pointer coincideswith the meter scale division labeled "C" - located at approximately 85 on the0-100 meter scale. This step in the procedure calibrates the instrument. Thecalibration should be rechecked occasionally while making measurements.

3. Set the RANGE switch to the 100~ range. Change the USE-LINEFREQ. -CALIBRATE switch to the LINE FREQ. position. The frequency of thepower line voltage is indicated by the meter. This measurement serves as acheck on the calibration of the ins trmnent.

CAUTION

No external voltage should be applied to the lOput terminals when thepower line frequency is being measured. Application of external voltage maycause inaccurate line frequency measurements.

4. Change the USE-LINE FREQ. -CALIBRATE switch to the USE posi­tion and apply the voltage to be measured to the INPUT terminals. Set theRANGE switch to cover the frequency being measured. If the approximatefrequency is unknown, turn the RANGE switch to the highest frequency range.Change the switch to successively lower ranges until a range is found that pro­duces a readable meter indication.

5. While the meter is indicating the frequency being measured, depressand hold in the TEST button. If the meter indication is unchanged by this test,then there is sufficient input voltage for the instrument to produce an accuratefrequency measureme'nt'. Insufficient input voltage, as shown by a loweredmeter indication when the TEST button is pressed, will cause inaccurate fre­quency measurements.

Attaching a Recorder to he Model 500A -

When a recorder is used with the Model 500A, it is neces sary that thecompensating resistor in the instrument be adjusted so that the resistance ofthe recorder matches the instrument.

This adjustment is made as follows:

1. Warm up the instrument and measure either the power line frequencyor the frequency of an audio os cillator. Note the frequency indicated by the meter.

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2. Plug the lead from the recorder into the RECORDER jack. If themeter (MI) indication is not the same as noted in step I, adjust R56 (See Fig.4) so as to produce the same indication as in step 1. When the recorder is dis­connected from the RECORDER jack, resistor R56 is removed from the circuitand R53 substituted so that the accuracy of the Model 500A is not impaired.

Using the Model 500A as a Tachometer -

The Model 500A may be employed as a tachometer by connecting a suit­able phototube to the instrument. A source of light to be reflected into the photo­tube, by a target painted on the rotating machinery being measured, must alsobe provided.

The above mentioned phototube and light source have been combined intoone assembly and may be purchased from the Hewlett-Packard Co. This acces­sory is called a Model 506A Tachometer Head Assembly.

Zero Meter Indication - T~'le meter pointer may not coincide with the zeroscale rllar~< when t~'le instrument 1S not oFerating. The meter pointer is correctlyadjusted a:'ld the adjustment screw sealed at the factory.

-5-

Circuit Description

The Model 500A Electronic Frequency Meter consists of a limiting am­plifier, an electronic switchi g circuit, a pulse counter circuit, a constant cur­rent regula or and a power supply.

A voltage of unknown frequency is applied to the limiting amplifier, tubesVI, V2, V3. Tubes VI and V2 amplify and flatten the peaks of the incomingvoltage. Tube V3 is a phas e inverter.

The square wave obtained from the plate circuits of tubes V2 and V3 isapplied to the switching circuit who ch is com.pos ed of tubes V4 and V5.

The space current for the two switching tubes is obtained from the con­stant current regulator. Alternate half cycles of the square wave causes all ofthe constant current to flow thlough tube V4 and charge one of the capacitorsC9-CI8. During the i tervening half cycles the constant current flows throughV5 and causes one of the capa 1tors C19-C28 to be charged. The time constantsof the two RC combinations R33, C9-C18 and R32, C19-C28 are equal. The re­sistor and capacitor values are such that, at the highest frequency to be counted,the capacitors will be fully charged before the end of the half cycle. The accu­rately controlled pulses from the capacitors C9 -C18 and C 19 -C28 are convertedto unidirectional pulses by the crystal rectifiers CRI-CR4 and the resultantcurrent is ind1cated by meter Ml. The meter ·ndi ation is proportional to thenumber of puIs es per unit of time and therefore to the frequency of the voltageapplied to the input of the instrument. The resistors R34 to R43 are shuntsacross the meter to adjust the current through the meter to the correct valuefor each frequency range.

Res1stors R55 and R56 are adjusted to match the resistance of the re­corder. They are automatically connected in series with the meter to compen­sate for the res1stance of the recorder when the recorder is not connected tothe lnstrument.

The constant current regulat.or consists of tubes V7, V8. Tube VB is avoltage regulator tube which maintalns a constant voltage on the screen grid oftube V7. A vol age dlvider R48, R49, R50 is connected between the screen gridand ground. The variable resistor (R49 on th1S d1vider is provided so that thevoltage applied to the grid of V7 may be adjusted to produce the desired con­stant current for the swltch·ng tubes This current is measured by switchingthe mete (M 1) acros the shunt resistor R2 7. This resistor 1S inserted in theplate Circuit of tube V7.

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Maintenance

Cover and Bottom Plate Removal -=

The bottom plate is removed by unscrewing the four screws, one in eachcorner of the bottom plate. which fasten the plate to the chassis.

The cover is removed by unscrewing the eight screws which fasten thecover to the ba k and top of the instrument.

Tube Replacement --

Any tube having RTMA standard haracteristics may be used for replace­ment purposes in this instrument.

Hum Balance Adjustment (R55) --

The adjustmen of the variable resistor for balancing out the unwanted60~ current is as follows:

1. Measure and note the power line frequency. Shield the INPUT termi­nals of the instrument. A shielded double banana plug is satisfactory.

2. Set the USE-LINE FREQ. -CALIBRATE switch to USE and the RANGEswitch to the 50~ position.

3. Adjust R55, located underneath the chassis and reached by removingthe bottom plate (See Fig. 4), for minimum meter (Ml indication .

4. Measure the line frequency and compare with previous line frequencymeasurement. If they are not the same, re-adjust R55 slightly to one side sothat the line frequency is correct.

Frequency Calibration Adjustment

The only calibration adjustment that should be performed in the field isthe adjus tment of the meter shunt resis tor s R34 to R43. If any of the couplingcapaci ors C9 to C28 are affecting the calibration, the instrument should be re­turned to he factory for adjustment.

The procedure for adjusting the shunt resistors is as follows:

1. _ Warm up the ins trument and set the controls for frequency meas­urement.

2. Starting with the RANGE switch at the 50~ position, apply a 50~

voltage to the INPUT terminals of the instrument. This voltage should be ob­tained from a secondary frequency standard or some other source of accuratefrequencies. If the meter does not indica e exactly full scale, then adjust thevalue of the shunt resistor R34 by substituting another resistor or by connec­ting a h' gh resistance ln parallel wi th R34.

-7-

3. Repeat step 2 for 1001\" 2001\, and etc. using a calibration voltage whosefrequency is equal to the full scale frequency of each range. Adjust the shuntresistor which corresponds to the range being calibrated.

Adjus

The pro edure for adjus ing he onstan current regulator circuit is asfollows:

1. Warm up the ins rumen using U5V line vol age. Set the USE-LINEFREQ. -CALIBRATE SWl ch 0 CALIBRATE. Adjust the CALIBRATE control sohat the me er indica es exactly 80 on the 0 0 100 scale.

2. Change the line voltage to 105 vol s and note the meter indi ation.Repea a 125 vol s line vol age. If he me er indication does no change morethan ±l% of full scale (80.5 to 79.5). en the regulator circuit is functionings atisfactorl1y.

3. If he meter indicatlOn is ot within he specified'limi s. then a newOD3 tube V8) and/or a new 6L6 tube (V7) should be tried. The OD3 ube shouldbe aged by operating it for eigh hours Wl h 150 volts applied across i s termi­nals. The easiest way 0 age the ube is 0 pu it in its socket in the instrumentand let the instrument opera e for eigh hours.

If changing tubes does not res ore he regulator circuit to normal. thenadditional adjus men s will be necessary.

4. With he line voltage at 115 olts. set the USE-LINE FREQ. -CALI­BRATE swit h at CALIBRATE. Se the CALIBRATE con rol to produce a me erindica ion 0 80. hen hange he USE---CALIBRATE switch 0 USE and apply a50,000 cycles/sec. voltage 0 the INPUT terminals. No e he me er indication.

5. Adjust R6l. (See Resis or Board Detail RBI, Fig. 5) by conne ting aresis or in parallel wi h R6l or by substitu ing a new resistor of higher value,so tha the me er does no vary more han ±l% of full scale when the power linevoltage is varied from 105 to 125 vol s.

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6. Withoutand inpu frequencypower line vol age.variations from heless, he circuit is

hanging he CALIBRATE con raj. change the RANGE switcho 1000 cycles/sec. Note th me er indication with 115 voltsChange power Ii e voltage to 105 and 125 volts and note any

indica io obtained at 115 volts. If the variation is ± 1% ororrec ly adjusted.

However. if he varia ion is m re han ±1% then the value of R61 shouldbe changed so as 0 ob ain the bes compromise between the 1000 and 50.000cycles/sec. adjustmen s.

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TAB L E OF REP L ACE A B L EPA R T S

CircuitRef.

Cl

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C8

Description

Capacitor: fixed..! paper,o 1 ~f7 ±100/0s 600 vdcw

Capacitor: fixedg electrolytic,10~ 10, 10 ~f, 450 vdcw

Capacitor: fixed,' paper,. 5 ~f, ±100/0, 400 vdcw

Capacitor: fixed, paper,. 1 ~fg ±100/0, 600 vdcw

Capacitor: fixed, electrolytic,20, 20 ~f. 450 vdcw

Capacitor: fixed. electrolytic,50 ~f, +200%. -10%, 50 vdcw

-hp­Stock No.

16-1

18-31

16-58

16-1

18-22

18-50

Mf:r. * & Mfr s .Designation

CC#73P 10496

XFPT-389

CC#4TM-P5

CC#73P 10496

AAEF - I11X3"

C9 - C28 . '. Part of Range Switch Assembly

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C29, C30

C3l

R4

R5

R6

R7

R8

R9

RIO

R11

Capacitor: fixed, paper,.Ol~, ±10%. 600 vdcw

Capacitor: fixed,. electrolytic,20 ~f, 450 vdcw

Resistor: fixed, composition,470.000 ohms, ±10%, 1 W

Resistor: fixed, composition,6.8 megohms, ±10%, 1 W

Resistor: fixed, compositicn,120,000 ohms, ±lO%g 1 W

Resistor: fixed, composition,1000 ohms, ±100/0, 1 W

Resistor: fixed, composition,560 ohms. ±10%, 1 W

Resistor: fixed, composition,1. 8 megohms, ±lO%, 1 W

Resistor: fixed, composition,22, 000 ohms, ±100/0. 1 W

Resistor: fixed. composition,3.9 megohms, ±10%, 1 W

Resistor: fixed. composition,33.000 ohms, ±10%, 1 W

16-11

18-20

24-470K

24-6.8M

24-120K

24-1000

24-560

24-1. 8M

24-22K

24-3.9M

24-33K

AType p688

XFPS-144

BGB 4741

BGB 6851

BGB 1241

BGB 1021

BGB 5611

BGB 1. 851

BGB 2231

BGB 3.951

BGB 3331

*See "List of Manufacturers Code Letters For Replaceable Parts Table."-10-

TABLE OF REPLACEABLE PARTS

Circuit -hp- Mh.• Ie Mfrs.Ref. Description Stock No. Designation

R12 Resistor: fixed, COInposition, 24-15K B15,000 ohm.s, ±10%, 1W GB 1531

R13 Resistor: fixed, cOInposition, 24-56K B56, 000 ohIns, ±10%, lW GB 5631

R14 Resistor: fixed, Co.m.positi on, 24-100K B100,000 ohIns, ±10%, 1 W GB 1041,.

R15 Resistor: fixed, COInposition, 24-270K B270,000 ohIns, ±10%, 1W GB ~741

R16 Resistor: fixed, co:rn.position, 24-560 B560 ohtns, ±10%, lW GB 5611

R17 Resistor: fixed, co.m.posi tion, 24-22K B22,000 ohIns, ±10%, lW GB 2231

R18 Resistor: fixed, co.m.posi tion, 24-15K B15, 000 ohIns, ±10%, lW GB 1531

R19 Resistor: fixed, COInposition, 24-33K B33, 000 ohIns ±10%, 1W GB 3331

R20 Resistor: fixed, cOInposition, 24-56K B56,000 ohIns, ±10%, lW GB 5631

I

R21 Resistor: fixed, co.m.position, 24-22K B22, 000 ohIns, ±10%, 1W GB 2231

RZ2 Resistor: fixed, composition, 24-s60 BS60 ohIns, ±10%, 1W GB 5611

R23 Resistor: fixed, co.m.position, 24-270K B270,000 ohms, ±10%, 1 W GB 2741

R24 Resistor: fixed, cOInposition, 24-lSK BlS,OOO ohIns, ±10%, lW GB 1531

R25 Resistor: fixed, co.m.position, 24-33K B33,000 ohms, ±10%, 1W GB 3331

R26 Resistor: fixed, co.m.position, 24-470K B470,000 ohms, ±10%, lW GB 4741

R27 Resistor: flxed, w1rewound, 100 ohms SA-26 HP

R28 Resistor: fixed, composition, 24-100K B100,000 ohIns. ±10%, 1 W GB 1041

*See "List of Manufacturers Code Letters For Replaceable Parts Table."-11-

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TABLE OF REPLACEABLE PARTS•

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CircuitRef.

R29

R30

R31

R32 pR33

R34-R43

R44

R45

R46

R47

R48

R49

R50

R51

R52

R53

R54

R55

Description

Resis or: flxed p compositionp220,000 ohms p ±10%p 1 W

Resistor: fixedp composibonp270 p000 ohms p ±10%p 1 W

Resistor: ftxedp composibon,22 p000 ohms, ±10%p 1 W

Resistor: fixed. wirewound,5000 ohms, ±10%p 20 W

Electrical value adjusted a factory

Resistor: ftxed, composition,33 ohms, ±10%. 1 W

Resistor: flxed, composibon,100,000 ohms p ±10%p 1 W

Resistor: fixed, wirewoundp10,000 ohms, ±10%, 27 W

Resistor: fixed, wirewoundp5000 ohms p ±10%, 20 W

Resistor: ftxed, composition,33,000 ohms, ±10%, 1 W

Resistor: variable, composition,25,000 ohms p linear taper

Resistor: fixed p compositionp82,000 ohms p ±10%, 1 W

Electrical value adjusted at factory

Resistor: variable, wirewound,100 ohms, linear taper

Resistor: fixed, wirewound,1000 ohms p ±10%, 1 W

Resistor: fixed, compositionp1500 ohms. ±1%, 1 W

Resisto : fixedp compositionp56,000 ohms p ±10%, 1 W

ReSistor: variable. wirewound,50 ohms, ±10%p 3 W

-hp­Stock No.

24-22K

27=3

24-33

24-100K

27-4

27-3

24-33K

210-54

24-82K

M-80

26-15

31-1500

24-56K

210-2

Mh.• at Mfrs.Designation

BGB 2241

BGB 2741

BGB 2231

SType 2R

BGB 3301

BGB 1041

SType 2R

SType 2R

BGB 3331

B

B

HP

RType BW-l

GGType CP-1

BGB 5631

G#21-010-067

*See "List of Manufacturers Code Letters For Replaceable Parts Table. II

-12=

TABLE OF REPLACEABLE PARTS •

CircuitRef.

R56

Description

Resistor: variable, wirewound.300 ohms, linear taper

-hp­Stock No.

210-53

Mh.• & Mfrs.Designation

G#21-010-358

R57 Electrical value adjusted at factory

R58, R59

R60, R61

Resistor: fixed, composition,100,000 ohms, ±10%, 1 W

Resistor: fixed" composition,100,000 ohms, ±10%. 1 W

Electrical value adjusted at factory

Binding Post:

24-l00K

24-100K

312-3

BGB 1041

BGB 1041

HP

CRI-CR4 Crystal Rectifier:

F 1 Fuse: 1 AFuseholder:

Indicator Lamp Assembly:

Knob: 1-1/2" diarn.Knob: 2 11 diam o

212-GllB

211-18312-8

312-10

37-1137-13

HP CINJu)T, #1040T, #342001

BB, #807BS

HPHP

,

II

JlJ2

Ml

PI

Ll

Sl ABS2S3 ABCS4

Tl

V I, V2,V3V4, V5V6V7V8

Lamp:

Telephone Jack:Telephone Jack:

Meter:

Power Cable:

Reactor: 6 H @ 125 MA, 240 ohms

Rotary Switch:Push Button Switch:Range Switch AssemblyToggle Switch:

Power Transfor,mer:

Tube: 6SJ7

Tube: 6V6Tube: 5Y3GTTube: 6L6Tube: OD3

211-47

38-2538-194

112 -17

812-56

911-4

310-69310-535A-19W310-11

910-56

212-6SJ7

2l2-6V62l2-5Y3GT212 -6L 62l2-0D3

O. Mazda #47

x, #706Switchcraft, Inc.

HP

HP

HP

HPSwitchcraft #1003HP

, D, 20994NV

HP

zz

zzzzzzzz

U1oo~

*5ee "List of Manufacturers Code Letters For Replaceable Parts Table."-13-

•

LIST OF MANUFACTURERS CODE LETTERSFOR REPLACEABLE PARTS TABLE

I

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Code Letter

ABCDEFGHHPIJKLMNaPRSTVXZAACCDDEEFFHHIIKKLLMMZZ

Manufacturer

Aerovox Corp.Allen-Bradley Co.Amperite Co.Arrow, Hart and HegemanBussman Manufacturing Co.Carborundum Co.CentralabCinch Manufacturing Co.Hewlett-PackardClarostat Manufacturing Co.Cornell Dubilier Electric Co.Hi-Q Division of Aerovox Corp.Erie Resistor Corp.Federal Telephone and Radio Corp.General Electric Co.General Electric Supply Corp.Girard-HopkinsInternational Resistance Co.Lectrohm, Inc.Littelfuse, Inc.Micamold Radio Corp.p. R. Mallory Co., Inc.Sangamo Electric Co.Sarkes TarzianSprague Electric Co.Stackpole Carbon Co.Sylvania Electric Products. Inc.Western Electric Co.AmphenolDial Light Co. of AmericaSwitchcraft, Inc.Gremar Mfg. Co.Carad Corp.Any tube having RETMA standard characteristics

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CLAIM FOR DAMAGE IN SHIPMENT

The instrument should be tested as soon as it is received. If it failsto operate properly, or is damaged in any way, a claim should be filed with thecarrier. A full report of the damage should be obtained by the claim agent,and this report should be forwarded to us. We will then advise you of the dis­position to be made of the equipment and arrange for repair or replacement.Include model number, type number and serial numQer when referring to thisinstrument for any reason.

WARRANTYHewlett-Packard Company warrants each instrument manu­

factured by them to be free from defects in material and workman­ship. Our liability under this warranty is limited to servicing oradjusting any instrument returned to the factory for that purposeand to replace any defective parts thereof (except tubes, fuses andbatteries). This warranty is effective for one year after deliveryto the original purchaser when the instrument is returned, trans­portation charges prepaid by the original purchaser, and which up­on our examination is disclosed to our satisfaction to be defective.If the fault has been caused by misuse or abnormal conditions ofoperation, repairs will be billed at cost. In this case, an estimatewill be submitted before the work is started.

If any fault cievelops, the following steps should be ,taken:

1. Notify us, giving full details of the difficulty, and includethe model number, type number and serial number. On receipt ofthis information, we will give you service instruction or shippingdata.

2. On receipt of shipping instruction, forward the instru­ment prepaid, and repairs will be made at the factory. If request­ed, an estimate of the charges will be made before the work beginsprovided the instrument is not covered by the warranty.

SHIPPINGAll shipments of Hewlett - Packard instruments should be

made via Railway Express. The instruments should be packed in awooden box and surrounded by two to three inches of excelsior orsimilar shock-absorbing material.

DO NOT HESITATE TO CALL ON US

HEWLETT-PACKARD COMPANY

1;,6~rn{~ryj;'S{rl1mfltl~rJprpJmiffJ{rrurucy

395 PAGE MILL ROAD '!.!.p PALO ALTO. CALIFORNIA

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